Metallic cross-arm pin.



I. G. s. LINDHOLM.

METALLIC CROSS ARM PIN. APPLICATION FILED IIo\I I9. Isn.

1,171,127. PIII-,en dFeb.8,I9I6.

2 TS-SHEET h aziz...

' o v1. G. s. LINDHOLM.

METALLIC CROSS ARM PIN. l I

y APPLICATION FILED NOV. I9. 1914. I I 1,171,127. Patented Feb'. 8,1916.

' 2 SHEETS- SHEET 2.

l/I/ l I I f II 1 I iii JOHN G. S. LINDHOIM, F CHICAGO,

IILINOIS, ASSIGNOR ,TO ANDERS P. LINDKOLH,

0F CHICAGO, ILLINOIS.

uETALLIc (moss-imm PIN.

Specmcation of Letters Patent.

Patented Feb. 8, 1916.

-' Application led November 19, 1914. Serial No. 872,939.

j To all whom it may concern:

In general I llas Be it known that I,` JOHN G. S. LIND- HoLM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Metallic Cross-Arm Pins, of which the following is a specification.

My invention relates to improvements in metallic cross arm pins for the .support of frangible insulators, such as are cominonly employed for exterior electric wirniong the objects of my invention arer to provide for the construction of an insulator pin that will be cheap, simple and v efficient; adapted to be made of sheet metal by simple forming'- operations; adapted to be used under a variety of the Ocharacter of the support therefor; and arranged to coperate with the insulator to insure adequate retention of the insulator against displacement or rattling, but without liability to fracture the insulator under changing temperature or weather conditions.

In the drawings wherein I have illustrated several structures embodying features of my invention, Figure 1 is a vertical section on line 1-1 sheet metal cross-arm-pin in association withan insulator and a cross arm, and, in dotted lines, showing its availability for connection with another form of support. Fig. 2 is a cross section on line 2-2 of Fig. 1 and Fig. 3 is a perspective view of one insulator-pin section. Fig. 4 shows in transverse section a modified structure embodying features of my invention. Fig. 5 is a cross section thereof on line 5-5 of Fig. 4. Fig. 6 shows in side elevation the form of device illustrated in Fig. 4. Fig. 7 illustrates another modified structure embodying features of my invention, and Fig. is a fragmentary detail in section on line 8--8 of Fig. 7.

contemplate sulator pin of sheet metal in a plurality of 4generally-similar longitudinal sections such as may readily be made by ordinary metal working machinery and adapted for aemblage back-to-back jointly to form the pin.

These sections may conveniently be formed of metal grooved or channeled in cross section throughout, and generally shaped in U- conditions as to of Fig. Qshowing al making the inor V-form, so that throughout the insulatorreceiving stem portion the radially trending fins or webs may be threaded on their edges to coperate with the threaded interior of the insulator in an adequate number of vertical planes -to support and position the insulator. These threaded stem portions, I contemplate, shall be normally resiliently separated somewhat at their backs so that when engaged by the glass insulator they exert a spring tension on the interior of the insulator, preventing rattling or displacement, and yet affording a yieldabilitv that enables the threaded pin structure to come and go under the influence of temperature variations thereby to avoid fracturing the glass insulator. Further I contemplate that below the threaded stem portion of each pin structure the middle or body portion shall be` expanded for strength and enlargement of the base area and shall lead into horizontal base shoulders that afford adequate bearing sur- 'face for support of the pin against tipping; and that anchorage means be provided in conjunction with said seating base portions so that Athe pin may readily be applied to cross arms or other supports. Preferably also, I provide means for uniting the sections at a bearing-point or spring fulcrum substantially at the point where the stem and body parts merge, and such bearing points at the backs of the grooved sections make wide enough for firm, adequate contact.

In the specific constructionsshown 10 indicates in general an insulator of well knownform having an internally threaded tapering socket 10', and 11 represents in general the pin structure by which said insulator is to be connected to the cross arm 12a or other suitable support.

Referring to the construction shown in Fig. 1 the pin 11 is composed of twovertically separable members 12-12 which may be, insubstance, duplicates. Each said pin section as shown consists of a single piece of sheet metal bent to form a V-bar, having the two wings 13-13 preferably connected by a narrow, flat back 14, which is preferably tapered to the disappearing oint at its bottom end as indicated at 14 he upper end of each section, forming a stem portion 15, has its edges corrugatedas at 16 to form threads and below the stem rated at their edges as at 20 and tapered ceive nails or other attaching devices ymay at the bottom as at 21. -Apertures'22 to rebe made in the back portions 14 of the post parts 19 of the structure.

and secured together they form the com- `free for still further pleted pin. Such union between two sec# I tions may l 15v be effected in various ways, but preferably I form in each Section, contiguousto the junction of the body portion and stem portion thereof an aperture 23 from which is struck out an attaching ear 24, the ears on` the two members respectively being Aunited to the top and bottom edges of their apertures so that in assembling the ear of each member may pass through the aperture in the other and be upset to rivet the parts together. Additional connections may be provided, as shown, at other points on the body or post. The structures are so formed that when the meeting parts ofthe two back walls are brought together the 'upper portions thereof local to the threaded stem parts 15 are sprung apart somewhat, to an extent slightly greater than that indicated in Fig. 1, so that when the taper-socketed insulator is screwed on the stem it brings the two stem members. together somewhat, putting them under tension but leaving them yielding so that they may act resiliently to compensate for differences in expansion and contraction between the glass and metal under varying temperature conditions.

It will be observed that with the construction as above described the post vportion of the pin structure may be driven into an or: dinary pin opening in a cross arm, or it may, of course, be driven into the end of a post or into wood of comparatively low density, by direct hammering, like a spike;

or the lower portions of its post structure may be 1pried apart below the lowest engaging hoo ,23, and the pin may be attached to the roof peakof a house or other angular structure, the sheet metal being readily susceptible of being battered down with a hammer to lie flat at its lower edge, and the opening 22 permitting the structure readil to be nailed to its support. In Figs. 4 to 6 is shown a structure preferably made with a somewhat broader'U- shaped channel, but -with the twochannel formed members affording a ytapering threaded stem portion 115 substantially as heretofore described. The .body l117, however, may be formed by diverting the two channel members to give a wide base effect, and then bringing them back toward each j and each side" ed es meeting, When two of, these sections are assembled back to back` lthe stem and body portion,

the side flanges being preferably s read apart at the base as indicated at 118 in Fig. 4. At the center the 'two converging base members 118 may bedeected downward n shaped into semi-cylindrical shellform as indicated at 119, thereby providing jointly a hollow cylindrical shell, with its lugs 121 being provided on theJ ottom of the shell members adapted to be upset on the under side, of an aperture in the cross arm to preventwithdrawal of thel cylindrical post portion of the pin. These two post portions fitted togetherinto a receiving aperture firmly position the structure, and their uniting action may be, supplemented by a union of the back portions of the two sections at substantially the junction of the body and pin, by means of slots and ears 123 substantially as heretofore described. Y

In the form of construction illustrated in Figs. 4 to 6 the breadth of the base 118, in a line transverse to the expected line of strain of the wires to be supported, is inv creased only by deflection of the side flanges of the U-shaped channel member, but as shown in Fig. 8 the breadth of the base in 4other to afford theseating surface as at 1,18,

this direction may be increased, if desired,

by gradually widening the back wall lof the channel, indicated as 214, throughout` the body portion. Also it is often desirable to use a construction that may be attached ,to a cross arm with an ordinary bolt in lieu of an integral post member ofthe pin itself, and this result I may attain, as indicated in Figs. 7 and 8, in advantageous fashion by utilizing a construction generally similar to that shown in Fig. 4 as to Athe structure of but having the base formed by two overlapping members 218 and 218, the member 218 forming an integral continuation of the back wall of its section and the member 218 likewise con-l e opposed base member.

e I have herein described in some detail particular embodiments of my invention that are especially adapted to meet the somewhat varied requirements of practice, it will be understood by those skilled in the opposite directions, and eachtakmg through a corresponding aperi 1ture 1n th 'art that my invention is shown in modified embodiments not with intent to limtit to the particular construction shown, but as illustrative of the fact that changes in detail may `be made without departure from th spirit of my scrpe ofthe appended claims.

aving thus describedmy invention, what I claim is 1. An insulator-pin comprising a plurality of channeled sections,- each providing a .body portion and a stem ortion, said sections meeting back to bac -below the stem portions and separated at the tops of the stem sections.

2. An insulator-pin comprising a plurality ofchanneled sections, each providing a body portion and a stem portion, said secportions and separated at the `tops of the stern sections; and means for securing said body portions fixedly to a support, whereby the point of jointure acts. as a fulcrum;

for resilient movement of the stem ends. 3. An insulator pin composed of sheet metal formed into similar vertical sections each providing `a l of channeled cross l section, stem portion broadened back portion at the lower end of the stem portion, for mutual bearing of the sections back to back, and an enlargedv base` portion affording -a horizontal seating sur.- face. i p

\ 4. nAn insulator pin composed ofsheet metal formed into similar vertical sections of channeled cross section,

. the stem sections invention and' within the vity of channeled threaded on its web-edges, a

each providing a stem portion threaded on -its web-edges, a broadenedback portion at the lower end of ortion, for mutual bearing of the ack to back, an enlarged base ortion affording a horizontal seating surace andpintegral means for connection of the back portions of said sections.` i v 5. An insulator pin comprim'ng a pluralsections, each providing a body portion and a stem portion threa ed on its web-edges, said sections being positioned back to back and means for connect-v ing the channel baciis together.

6. An insulator pin comprising two longitudinal sections, each roviding a threaded stem portion, an e having a horizontal seating surface, a hole- -engagin post portion, said sections meeting'bac to back below the upper ends of the stem portions, and the upper extremities of. said stem portions being resiliently separated.

7 In an insulator pin, the combination of two channeled, sheet metal sections providin stem 'portions formed with diverging we sjshreaded at their edges, base portions having horizontal seating surfaces, and inte al post-members.

n 'testimony' whereof I hereunto set my hand in Athe presence of two subscribing witnesses.

JOHN G. S.V LINDHOLM. VIn the presence or`l Lonn'r'rii A. GrBBoNs,

MARY F. ALLEN.

arged base portion L 

